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                [AMPPZ2014]The Staging                </h1>
                <p>时间限制：50s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：256MB</p>			</div>
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                                <h3>题目描述</h3><p><div>在舞台上有n个枪手，第i个枪手瞄准了第p[i]个枪手，将于第u[i]秒开枪。一个枪手如果成功开枪，</div>
<div>那么被瞄准的枪手会立刻死亡。</div>
<div>现在给出q次修改操作，请在一开始和每次修改操作后统计出最后存活的枪手个数。</div>
<div></div>
<p></p></p><hr/><h3>输入格式</h3><p><div>第一行包含一个正整数n(1&lt;=n&lt;=200000)，表示枪手的个数。</div>
<div>第二行包含n个互不相同的正整数p[1],p[2],...,p[n](1&lt;=p[i]&lt;=n,p[i]!=i)，依次表示每个枪手的目标。</div>
<div>第三行包含n个正整数u[1],u[2],...,u[n](1&lt;=u[i]&lt;=10^9)，依次表示每个枪手的开枪时间。</div>
<div>接下来一行包含一个正整数q，表示修改操作的个数。</div>
<div>接下来q行，每行包含两个正整数k,v(1&lt;=k&lt;=n,1&lt;=v&lt;=10^9)，表示把u[k]修改为v。</div>
<div>数据保证任何时刻任意两个枪手的开枪时间都不同。</div>
<div></div>
<p></p></p><hr/><h3>输出格式</h3><p><div>第一行包含一个正整数，即在进行修改之前最后存活的枪手个数。</div>
<div>接下来q行，每行包含一个正整数，第i行输出在第i次修改之后最后存活的枪手个数。</div>
<div></div>
<p></p></p><hr/><h3>样例输入</h3><pre>4
2 3 4 1
1 2 3 4
3
1 8
2 7
3 6</pre><hr/><h3>样例输出</h3><pre>2
2
1
1</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>鸣谢Claris上传</p>
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